Project Description

More than 65% of imported extra virgin olive oil is defective due to poor handling or the deliberate addition of extraneous, non-beneficial oils. The most prevalent and identifying defect in olive oil is rancidity, indicating the absence of expected health benefits such as antioxidants and polyunsaturated fats. This summer, we are assembling a biosensor capable of quickly and cheaply evaluating rancidity defects in the chemical profile of olive oil, providing both consumers and retailers with a means of ensuring product quality.

Current methods for detecting defects in olive oil are complicated and time-consuming. The current gold standard, GC-MS, is slow and expensive. In addition, most biosensors are limited to detecting one analyte at a time, restricting the scope of their utility in food science. Our team is developing a biosensor which couples enzyme engineering with fundamental principles of electrochemistry to engineer an instrument capable of identifying multiple analytes in a sample and their corresponding concentrations. We have identified straight-chain, aliphatic aldehydes of varying chain lengths as indicators of rancidity in olive oil. Just as a glucose meter utilizes enzymes to quantify the amount of glucose in a sample, we are using the same principles to quantify the concentration of different aldehyde species in olive oil. Where a glucose meter utilizes one type of enzyme to identify one analyte, we are engineering a panel of enzymes to identify a myriad of aldehyde species. In separate reactions, each enzyme will have a narrow substrate specificity profile, only reacting with aldehydes of a specific chain length to produce a detectable byproduct. The byproduct created by each enzyme may be effectively quantified through our electrochemical platform. By coupling and multiplexing these enzymes with several electrochemical cells, our electrochemical biosensor will efficiently and simultaneously identify and quantify multiple indicators of rancidity in olive oil.

Our modular electrochemical biosensor may identify the chemical profile of compounds in a sample of olive oil. This will provide a rapid, accurate assessment of the oil’s quality, allowing consumers and retailers to cheaply and effectively distinguish between healthy and defective olive oil. Producers, packagers, and retailers may pre-screen outgoing oil to confirm the quality of the oil. Given the lack of certified quality control entities in the U.S., the development of a widely accessible device will enable the olive oil industry to effectively regulate, monitor, and safeguard its reputation.